body{
    background-color: #d7fff5;
}
.flex {
    display: -webkit-box;
    display: -webkit-flex;
    display: -moz-box;
    display: -ms-flexbox;
    display: flex;
}
.img-holder{
    width: 300px;
    height: 300px;
    background: url(https://c0710.gitee.io/test/images/big-pic.2802ca6d.png);
    border: 1px solid #0088cc;
}
